package cn.zhihong.filter;

import cn.zhihong.common.R;
import com.alibaba.fastjson.JSON;
import com.sun.deploy.net.HttpResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @ClassName LoginCheckFilter
 * @Author 庄志宏
 * @Date 2022/4/20 19:31
 */
@WebFilter(filterName = "LoginFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {  //配置校验登录状态的过滤器
//    路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
//        获取本次请求的URL
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
//        定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",  //移动端发送短信
                "/user/login" //移动端登录
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(servletRequest, servletResponse);//放行的语句
            return;
        }
        //1判断登录状态，如果已登录则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(servletRequest, servletResponse);//放行的语句
            return;
        }

        //2判断移动端用户登录状态，如果已登录则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            filterChain.doFilter(servletRequest, servletResponse);//放行的语句
            return;
        }
        //如果未登录，则返回未登录结果
        log.info("用户未登录");
        servletResponse.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * @author 庄志宏
     * @date: 2022/4/20 20:12
     * 路径匹配，检查本次请求是否需要放行
     */
    public boolean check(String[] urls,String requestURI){
        for (String url:urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
